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Warnings concerning a multilevel analysis with dichotomous outcomes

  • 1.  Warnings concerning a multilevel analysis with dichotomous outcomes

    Posted Mon July 27, 2020 02:29 PM

    Hello :)

    Actually I'm doing my Master thesis and therefor I'm running a multilevel analysis with clustered data, but actually I get some warnings.

    I have 103 participants and each of them answered up to 21 questionnaires (3 times daily). I have some missing data, but I ordered the data in the vertical format, so I'm loosing around 10% of the measurements.

    If I run the null model for a binary outcome (nominal scale; 0,1 format), to check what proportion of the variance is caused by clustering of the data, the model is running but I get two warnings, and I'm not sure if I can ignore them.

    I get the following warnings:

    glmm: One or more records are not used in the analysis because they have one or more fields with invalid or missing values.

    glmm: Valid values for events (target) and trials variables are non-negative and positive integers respectively, and the number of trials cannot be less than the number of events.

    If I rerun the model after adding predictors the same warnings are displayed but the analysis is nevertheless running..

    I use the following syntax for my model:

    GENLINMIXED

     /DATA_STRUCTURE SUBJECTS=Person REPEATED_MEASURES=MP_timec COVARIANCE_TYPE=AR1

     /FIELDS TARGET=ND_Fortschritt_GMc_Cutoff TRIALS=NONE OFFSET=NONE

     /TARGET_OPTIONS DISTRIBUTION=BINOMIAL LINK=LOGIT

     /FIXED USE_INTERCEPT=TRUE

     /RANDOM USE_INTERCEPT=TRUE SUBJECTS=Person COVARIANCE_TYPE=VARIANCE_COMPONENTS SOLUTION=FALSE

     /BUILD_OPTIONS TARGET_CATEGORY_ORDER=DESCENDING INPUTS_CATEGORY_ORDER=DESCENDING

      MAX_ITERATIONS=100 CONFIDENCE_LEVEL=95 DF_METHOD=RESIDUAL COVB=ROBUST PCONVERGE=0.000001(ABSOLUTE)

      SCORING=0 SINGULAR=0.000000000001

     /EMMEANS_OPTIONS SCALE=ORIGINAL PADJUST=LSD.

    I would be very grateful if somebody could help me with my question.

    Thanks a lot!

    Elisabeth






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  • 2.  RE: Warnings concerning a multilevel analysis with dichotomous outcomes

    Posted Mon October 05, 2020 09:34 PM

    I am also having this exact same issue. Did you ever figure out how to resolve it?






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